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With that torque monster motor you can use 3:23 or 2:94 and still have an asphalt ripper. Use a shur-grip. My Barracuda has 3:73 with 28" tires and GV. With stock converter and my 904 I'm at 2400 rpm at 70 mph. I'm building a car now that will have 400 foot pounds torque with a T-10 4speed and...

I have one in my 67 Barracuda notch. 904 with 3:73 SG 8 1/4. I like it.

I put the GV in my 67 Barracuda with the 904. 3:71 gears. The only change I made was lowering the transmission crossmember about an inch and building a new driveline. The electrical work is more serious than the mechanical work.

The 3:55 ratio with the 15" wheels will be a nice combo with the power you will have at your disposal.

IMO the combination spider you put in the rear U joint is not causing the vibration unless it is installed incorrectly. It should easy to find, good luck with it.

Before I got to the end of your OP my thought was the TV linkage had loosened. Glad it was so simple, must be nice to have enough power to blow the driveline out of your car:-)

I went with a 999 lockup in my 67 coupe. I calculated 70 MPH @ 2400 RPM with my 3.73:1 gears and my tires and GV overdrive. I didn't want to give up the converter slip and my theory worked. Not large on black stripe burnouts but from 5 MPH hold on to your coffee cup and be ready to shift very...

Automatic

I installed one in my 67 Barracuda Notch. Details are in my build thread------------------- I really like it FWIW------------------------

Not to pirate the thread but I have the GV unit in my Barracuda. I have the foot switch and I also have the supplied manual rocker switch installed in the side of my console next to the red and green indicator lights. Point of information, the foot switch works really well and I use it more than...

Not that I recall, been a while. I just have two springs on my carb linkage and it works nice,

No return spring on the transmission. I thought the same thing about a dry transmission. I filled mine up, started the car and adjusted the setup per the lokar instructions. No worries mate:-)

I have the lokar setup on my 273/904 combo. The action is slightly stiffer than factory was but not enough to fret about. I adjusted the kickdown to fully engaged at WOT and have about 3K on the car since completion with a 700 mile road trip and no issues whatsoever. Good equipment imho.

No need to say it but read the book until you can recite it. I built two drivelines because the first one was too short and I missed it in the book. Aside from that my GV has been flawless.

I used their motor mounts and their transmission mount. The taller transmission mount complicated my gearvendors install. The harmonic vibration transfer with their units was such that I ordered factory replacement for all three. The transmission mount is changed but the motor mounts with stay...

3.73 W/OD

Put one in my 67 Barracuda-904. Extensive wiring and cabling, controller ect. I dropped my transmission crossmember about an inch to get everything proper clearance. Just follow the book. Build a new driveline and your overdriving.

Just a thought, get a digital angle finder and check your pinion angle setup. That was the problem with my GV equipped Barracuda.

I put an 8 1/4 A body with SG unit in my Barracuda. Bought correct shock plates and u-bolts used from a member here. I just rebuilt my leaf springs at the time and everything went together really well. Had to have a custom driveline built as I installed a GV overdrive. It's a good swap.

Depends on what you want to do with your car. I wanted to road trip mine at a reasonable RPM and my install cruises at 70 MPH at 2300 RPM with 28" tires and 3:73/1 SG gears. Yeah its a little money but I want to cruise RT 66 with my Notch-----------------

I have that setup in my Barracuda. As quick as my car goes through the gears 1-4 is as fast as I can react. I know that to try to split/shift it would be way slower and cost time in the end.

I lowered the transmission crossmember 1" and shimmed the rear axle at the spring perches 1.5 degrees. The details are on my build thread.

I lowered the transmission crossmember 1" and shimmed the rear axle at the spring perches 1.5 degrees. The details are on my build thread.

I have a gearvendors unit in my 67 notch, 273-904 with 3:73.1 shurgrip. Sweet, 2400 rpm at 70 mph. Smooth as silk!

I would say yes, there could be a difference-----------

I know it's not everyone's first choice but I have a 999/GV setup in my 67 Notch and it performs flawlessly. 3:73-1 SG with 28" tall tires = 2400 RPM @ 70 MPH. I like it!

I used a NAPA master rebuild kit for the recondition and a Transgo TF2 for shifting where I wanted it. The results are a 10 of 10!

I had clearance issues with my 273/904 combo and stock rear suspension in my 67 barracuda. Be interesting with a big block/727. My details are in my build thread.

No, takes work.

You will lose 2-300 RPM with a good standard TC.